- Machine Shop & Tool Repair Service, Beamsville
- Machinery, Supplies & Equipment - Business Production Related, Beamsville
- Machinery, Supplies & Equipment - Business Supplies Related, Beamsville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Beamsville
- Mailing, Delivery & Courier Service, Beamsville
- Major Appliances, Beamsville - Household & Kitchen
- Management Consultants & Services, Beamsville
- Manicurists & Pedicurists, Beamsville
- Manufacturers Agents & Representatives, Beamsville
- Manufacturers Representative, Beamsville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Beamsville
- Manufacturing Products, Beamsville
- Marriage & Family Counselors, Beamsville
- Martial Arts & Self Defense Schools, Beamsville
- Masonry Materials & Supplies, Beamsville
- Massage Therapists & Professional, Beamsville
- Massage Therapy, Beamsville
- Meat Packers, Beamsville
- Mechanical Contractors, Beamsville - Install, Service & Repair
- Medical Groups & Clinics, Beamsville - Medical & Health Centers
- Medical Supplies & Equipment, Beamsville
- Membership Sports & Recreation Clubs, Beamsville
- Metal Heat Treating, Beamsville
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- Metal Repair Service & Blacksmith, Beamsville - Iron Works
- Midwives, Beamsville
- Millwork Contractors, Beamsville
- Millwork Manufacturers, Beamsville
- Mini & Self Storage, Beamsville
- Miscellaneous Government, Beamsville
- Miscellaneous Manufacturing, Beamsville
- Miscellaneous Personal Services, Beamsville
- Miscellaneous Professional, Beamsville
- Modular Buildings, Beamsville - Modular Homes Buildings & Offices
- Mortgage Bankers & Correspondents, Beamsville
- Mortgage Companies, Beamsville
- Motion Picture & Television Production Services, Beamsville
- Motion Picture Pre & Post Production Services, Beamsville
- Motor Vehicle, Beamsville
- Motor Vehicle Rental & Leasing, Beamsville
- Moving Companies, Beamsville
- Moving Truck Rental , Beamsville
- Music, Beamsville
- Music Lessons, Beamsville
- Music Lessons - Instrumental, Beamsville
- Musical Instruments & Equipment Stores, Beamsville
- Musical Recording Services, Beamsville
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